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L5988D Fiches technique(PDF) 12 Page - STMicroelectronics

No de pièce L5988D
Description  Pre-bias start up capability
PDF  52 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5988D Fiches technique(HTML) 12 Page - STMicroelectronics

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Functional description
L5988D
12/52
DocID15324 Rev 4
5
Functional description
The L5988D is based on a voltage mode control loop. Therefore the duty ratio of the internal
switch is obtained through a comparison between a saw-tooth waveform (generated by an
oscillator) and the output voltage of the error amplifier as shown in Figure 3. The advantage
of this technique is the very short conduction time of the power elements thanks to the
proper operation of the control loop without a precise current sense, which instead is
required in current mode regulators. Thanks to this architecture the L5988D supports
extremely low conversion ratio (D = VOUT/VIN) even at very high switching frequency
(up to 1 MHz).
Figure 3. Voltage mode control loop
The main internal blocks are represented in Figure 4.
Figure 4. Internal block diagram
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP



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